Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm trying to monitor some web traffic using wireshark. Our web proxy is on port 9191. How can I get the wireshark view to treat port 9191 just like port 80 - ie as HTTP.

Just using Decode_As on the menu seems to allow half the conversation but only one side.

Any suggestions how to make this a permanent option?

share|improve this question
up vote 22 down vote accepted

If you go to Edit -> Preferences -> Protocols -> HTTP, you should find a list of ports that are considered to be HTTP. Add port 9191 to that list. I believe you have to re-start Wireshark and re-open your capture file or re-start your capture for this to take effect.

This is on the Windows version 1.0.3; it might be slightly different on other platforms. Obviously this isn't a generic way to alter the port to protocol mappings, but the authors of the http decoder seem to have recognized that people run it on many different ports.

share|improve this answer

That's because it's only set up to decode it if one of the sides of the conversation is on port 9191.

wireshark decode diaglog

You need to set it so it reads, "TCP Both". That way it'll decode TCP/9191 traffic as HTTP if the source port is 9191 or if the destination port is 9191.

share|improve this answer

sysadmin1138 and James F's responses are both correct. James' response is probably "more correct" in this case since changes to the HTTP protocol preferences are sticky between runs of Wireshark. In version 1.2.0 and above, you can quickly jump to protocol prefs by right-clicking on items in the packet detail (middle) pane.

(Disclosure: I'm the lead developer)

share|improve this answer

In Decode At window use Both in front of TCP to decode packet using 9191 port number (source port or destination port) as HTTP.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.